Releasing Halt Mode By Interrupt - NEC PD789860 User Manual

(2) Releasing HALT mode
HALT mode can be released by the following three sources:
(a) Releasing by unmasked interrupt request
HALT mode is released by an unmasked interrupt request.
acknowledgment is enabled, vectored interrupt servicing is performed. If interrupt acknowledgment is
disabled, the instruction at the next address is executed.
Standby
release signal
Operating
mode
Clock
Remarks 1. The broken lines indicate the case where the interrupt request that has released standby
mode is acknowledged.
2. The wait time is as follows:
• When vectored interrupt servicing is performed:
• When vectored interrupt servicing is not performed: 1 to 2 clocks
(b) Releasing by non-maskable interrupt request of watchdog timer
HALT mode is released regardless of whether interrupts are enabled or disabled, and vectored interrupt
servicing is performed.
CHAPTER 15 STANDBY FUNCTION
Figure 15-2. Releasing HALT Mode by Interrupt
HALT
instruction
HALT mode
User's Manual U14826EJ5V0UD
In this case, if interrupt request
Wait
Wait Operating mode
Oscillation
9 to 10 clocks
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